DO NOT COPY THE ANSWER THAT IS ALREADY POSTED ON CHEGG.

3. The average wastewater flow to a WWTP is 40,000 m/day. The maximum flow rate of the wastewater is 5,000 m/h. Following bar screens and grit removal the wastewater is treated in two rectangular primary sedimentation tanks (W = 13 m, L = 50 m). For primary sedimentation the following constants can be used: 1) hydraulic surface loading rate: Vo = 2 - 4 m?/(m.h) 2) minimum retention time: tmin = 1 h 3) critical scouring velocity: Vs = 0.30 m/s (sand) 4) vs = 0.03 m/s (primary sludge) Vs = 0.02 m/s (activated sludge) Please answer the following: 1) Are the primary sedimentation tanks overloaded or not? (5 points) 2) Calculate the average depth of the primary sedimentation tanks. (5 points) 3) Check retention time at average flow. (5 points) 4) Explain how the primary sludge is removed from the sedimentation tanks using diagram of the primary sedimentation tank. (5 points)